#include <iostream>
class BlackScholesModel {
public:
    BlackScholesModel() : stockPrice(0.0), volatility(0.0), riskFreeRate(0.0), date(0.0) {}
    BlackScholesModel(double s, double v, double r, double d) : stockPrice(s), volatility(v), riskFreeRate(r), date(d) {}
    double stockPrice;
    double volatility;
    double riskFreeRate;
    double date;
};

int main() {
	BlackScholesModel bsm;
}